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Table 1-3. States Data Table for Normalized Weather Data from Table 1-1

By specifying what tokens associate and where (how strongly they bind), you can control how parse derivations are performed. For instance, giving left-associativity to the addition operator (PLUS), given an input 1+2+3, the parser automatically generates a nonambiguous derivation in the form of (1+2)+3. The basic arithmetic operators are left-associative and should be listed from the lowest precedence to the highest; in the example, the addition and subtraction operators have lower precedence than multiplication the way it should be. Other associativity specifications include %nonassoc and %right, which are used to denote that a given symbol doesn t associate or associates to the right, respectively. The former is useful for relational and equality operators such as <, >, or !=, where the operator isn t applicable if applied multiple times: 1 > 2 > 3 yields a syntax error. You can also give precedence to a rule by using %prec at the end of the rule and giving a token whose precedence is to be applied. You can list arbitrary tokens in the associativity and precedence declarations, even if they haven t been declared as tokens, and use them in such situations. You can find more details about specifying precedence at www.expert-fsharp.com/Topics/FsYacc.

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Tip One option for fsyacc.exe is -v, which causes fsyacc to produce a readable extract of the parser s states.

Now you just need to provide the interface file for both SOAP and REST calls. You can see them in Listings 4-24 and 25. Listing 4-24. Example soap.php to be Accessed at custom/service/v2_1/soap.php

Each state in this extract corresponds to one or more items, which are productions that indicate what has been seen while parsing them. This current position with respect to a rule is marked with a period (.). Furthermore, to each state belong various actions that are triggered by certain look-ahead symbols. For instance, the action in some state as follows action 'ID' (noprec): shift 7

Table 1-4. Cities States Data Table for Normalized Weather Data from Table 1-1

indicates that if the ID token, which has no defined precedence, is encountered as look-ahead, the parser pushes this token to the parsing stack and shifts to state 7. For reduce actions, the rule that is reduced is shown. An error (reject) or accept action is shown for tokens that trigger a syntax error or acceptance, respectively. The parser state extract also provides useful information about conflicts in your grammar. Conflicts arise when your grammar is ambiguous (which translates to having more than one choice for a parser action at any time), ultimately meaning more than one derivation can accept a given input. You can do a number of things to disambiguate your grammar. You can apply precedence to various tokens or rules, or rewrite your rules to be consistent and unambiguous. There are two main sources of grammar conflicts: reduce-reduce and shift-reduce conflicts. Reduce-reduce conflicts are considered really bad because there are multiple rules to reduce by at a given situation. Although fsyacc applies a disambiguation strategy (reducing by the grammar rule that was defined earlier), you should avoid reduce-reduce conflicts as much as possible. Shift-reduce conflicts arise when the parser has the choice to shift a token or reduce by a rule. Unless you fix this conflict, fsyacc favors the shift action and defers the reduction to a later point. In some situations (for instance, the dangling-else problem), this yields the expected behavior; but in general, any such conflict is also considered a serious problem.

You can generate the parsers and lexers by calling fslex and fsyacc: fslex KittyLexer.fsl --unicode fsyacc KittyParser.fsy -module KittyParser

Chdir('../..'); $webservice_class = 'SugarSoapService2'; $webservice_path = 'service/v2/SugarSoapService2.php'; $registry_class = 'customregistry'; $registry_path = 'custom/service/v2_1/customregistry.php'; $webservice_impl_class = 'SugarWebServiceImpl_v2_1'; $location = '/custom/service/v2_1/soap.php'; require_once('service/core/webservice.php');

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